# name = input("请输入英文人名:")
# print(name.upper())
# print(name.lower())
# print(name.title())

#保留两位小数
# x = 3.14159
# print(f"{x:.2f}")

# 列表的添加替换删除
# my_food = ["pizza", "burger"]
# friend_food = my_food.copy()
# friend_food.append("salad")
# friend_food[0] = "sandwich"
# friend_food.remove("burger")
# print(friend_food)

# def is_even(number):
#     if number%2 == 0:
#         return True
#     else:
#         return False
# number=int(input('输入数：'))
# print(number)